Piston skirt expander



Au@ 10 943 cs.` A. MARIEN E-r AL 2,3%375 PISTON SKIRT EXPANDER I Filed Nov. 19, 1941 2 Sheets-Sheet 1.

Aug. 1G, E943. c. A. MARnEYN E-rm.. 2,326,575

' PISTON SKIRT EXPANDER I Filed Nov. 19, 1941 2 Sheets-Sheet 2 itsV initiapnsition lite 'tori- Patented Aug. 10, `194.3

' Manufacturing, (forpo'laie'i,l St. Louis, Mo.; a'

`corporation ofMssouri f" 10m' muentinn hastorimprovementsin Y andi tensiozng devices. pistons,

which .devices .are ficoxmnonify nailed: piston .skirt expanders, amd it consists of tire novei tentures eaton and pnintedout-inffthe Claims. u U

The-.present is am improvement wer in 23589829? granted. to

'Charles A'Marien'on! 3U', "iii ft iii'asthe same objects as those embodfr'eiii inisaid purent,

4tiiwl'neiy,"the :expanding andi .reshaping-'0I a deiiormed piis'tonscirtvaind pressure the inside ofsaid along #aina'xis :at iight angles 'to-theaxis of tire piston bosses; Bout-in fadiiition 'ftheretoftl i'sso eonstiueted that it maybe more easily handled wiiiiefbeing inserteriin-te the skirt .or'removed '-therefron'r. f

eievamntheeeof; signers a intimi inngnunml k f' @mm mami en 'misti-stof niet :mi nig.

11i iste, icncrssesentionm detail; 'thefiiiie i i .;Reerring :to 'the mau/rings, `1E" representen quie Y '1min of, .a 4'typl'e-zilr :having the muni 'hoi-'dswftiie rod 25 :end Stine. piston x As stated above, after the pistoniJ has been im foxtlsome time; thefskigrti tifiereofV wears and. uiten: :becomes distorted so thetno properly infthe'engineeyhnder.

1A further @feet-.of the pnesentfimsmfment Y is thev embodying' *the expander of 1r-ireivrrs 'whereby tire supporting 'merniers-y for the yex throughout the rapidi'eoiproeatn-g action ofthe while in; use. v Y These features afs 'weili'aisothers inherentiin the invention will be-beter apparentremejdetaiied 2 :desmiption or the? in eonneotienvwiththe accompanying drames; inwhio-'it Fig-ure I is a combinationvside' Lelevati-er1 middle vertical section 'taikerli tirougir-a.' conven tionail typeffof piston -s'iowi'iigf our ifn'fprovecilskirt :expander `carried 'tiepiston andE 'exerting its tension on the lowerpart of the piston Fig. V2 Bfb'jm' 'DBFnffef-the pistemvshowiiigfthe expander *securetitherein 3- is e vertical longitudirieli sectiontaenythe of Fig. 1; Fig. f4 is a top'piitvn View of A proved expander showingboththe" expended v position when not the pil-stunl amdfthe operaci'fve position the piston skirt and exerting its` pressure the Tait'ter @posi-tion dotted); Fig. is' a: 'Vertical "lortg-ituiafiy sotion .on the l-ine 5--5 of 4;; Fig; 6- isaJ eombined fsiiie Aelevation and vertioa seetimn fof e. pistonskirt- ,simu/ringe diierent form-ef s'kirtexpander which hasriif disioziueii the-:operation oi fthezaeng'ine: (this View is for t' comparisonon'iy Wiiig. l); Fig. '7 is a plain View of amodiedform of the invention in which the ends of the spring member are held together by a, clip prior to the insertion of the expander in a, piston, one of the supporting lugs of the the; skirt lexpankieici--embndies-en fafnnfulaJrif member -fpirefe'mily in the shape effe-r1 mail) rpzalraiiei sides 5; 5G51' arcuate. pozrtisorzisz i 'which Jeonstiitiiiie the expanding' paints rot' expander; "The Yside ,lzippmpreite moli the/purpose foif'eoifitifeieting diheeskirtpiteiiettseoonsideraiiieioree'out f wsrnimen fv smtl;midiametneelly @Wem-6 l. mieles #Gef "Ilbviously"theflforce whichtime Kspring member 4' bears against the ersuiffat'ce offthe mism ski-et is :finsumcientf'ftefiwie 'the -sprfmg member iii-pif'efduring" the-opration of' the piston, As lin Patent No.72,198,829 We provide a pair of sheet metal supporting ears 8, '8'V which have perforated lobes V9., 9 attheir upper ends and extended channels-shaped formations I0, I

removeiifoin sKirtlS l. l 'l he other S cou-rse impafrtsifa 'surface of spring member 22 in at their lower ends. The channels l0, l' are provided with crimped retaining portions Vl I H- whereby the sides 5, 5', of the spring member 4 are securely held in assembly relation with the supporting ears v8, 8'. The outwardlypresented wall l2 of channel l0' is provided with an opening I3 through which the extremities 1, lof spring member4 .project (Figs. 1` and 4) YAs may be seen allowed to exert its tension at diametrically opposite points against the piston skirt.

in Fig. 2, the ears 8, `8'are confined betweenV bosses I, l and connecting rod 3 and the channel Y members I0, I0 are of -a length that they Iit snugly between opposite portions of piston skirt S .Y p so that when the skirt expander is mounted withf in the piston skirt it is securely heldin place so Y that there is no possibility 'ofY itsf workingl loose' y or tilting underV theV forces to which itis sub-v Y jected when the piston is in operation.V Furthermore the spring member 4 bears vwith a slight i .pressure against the inner surfaceof channel abutment members ID, l0' insuring that the Vendsl of these members will be held in intimateY contact with the piston wall; Even ifl the-spring member .4 should break because of the severe' action to which it is subjected and thus become detached from the supporting ears 8 il',L the latter will still be unable to workV looseias they are conned inone directionbetween bosses L l and connecting rod 3 and -they are conned in a direction at right angles thereto .by contact of the piston skirt with the endsof channel members I0, I0'.

1f it were not for the contact of theV channel members I0, IU' vwith opposite portions of the piston skirt, spring member 4 might under cer-V tain conditions work loose andslide through the channels 2| of'supporting ears 'Mly and become dislodged as shown in Fig.-v 6, under the hammering action to which the piston is subjected during i the operation of the engine, as; alluded to above.

*'From Vthe foregoing it is apparent that the extended portions I0, l0' of the supporting ears =8,. 8' not only'securely hold the spring member 4 within the piston skirt S but are themselves confined within said" skirt in such a manner lthat they cannot be subjected to pivotal motion which `wouldpermitthe expander totip as shown in A Fig. 6,. Our improved expander also has thead- 1 vantage over similar types of expanders as here-U tofore made i-n that Vthe placing of the -gap g in the side`v of the spring member 4 instead of.

in lthe end permits of greater contraction-of the'spring element, and: of course consequently t greater tension upon the piston skirt at diametrically opposite points when inserted therein'.YV

In the modification shown in Figs.f7 tor10 inclusive, spring-'member 22 isheld i-n assembled relation with supportingear 23 by bead 24 formed on -the edge of bottom wall v25 of 1' channel 26.

Y .Furthermore in this modification the ends 22', 22'

of spring 22 do not have'outwardly extending fingers as in the form Vshownv in Figs. 1 to 5 inclusive-as these ends'are held together for the purpose of contracting thespring-member 22 by a U-shaped clip 21, the ends 28, 28 of which are disposed in grooves 29y 29 formed in theupper to each end thereof.

The clip 21 serves to .hold the 22inV contractedposition-'until the expanderhas been positioned `within the piston after whichlthe clip 21 is removed and the spring member V22v thus close :proximity .extend therethrough; Y f

Having described our invention, we claim: l. A piston' skirt expander comprising anexpanding element having side members and piston skirt engaging members,V a supporting element secured to each of said sidemernbers, and extended f abutment portions on the 'supportingA elements.-

-2. A piston skirt expander comprising an expanding element having side members and pistonskirtgengaging members, a supporting element secured toeach of said side members, each of the supporting 'elements having elongated chan- -'f nel parts embracing and extending beyond aside member@ of the expanding element.

3. 'Apis'ton expander comprising a spring e element of the general shape ofan elongated oval having agap in one side thereof and outwardly projecting vfingers adjacent to said gap, and a supporting element-secured vto each` side of said spring element, Aone of said supporting elements being recessed to permit the projectingngers to 1. A piston skirt :expander comprising a spring velement of the general shape of an elongated oval havinga gap in one side thereof, a supporting element-secured to each side .of-said spring element, and extended abutment portions on the supporting elements. A Y t 5. In combination with aV piston having a skirt and 'piston pin bosses for the receptionof va piston pin, a piston skirtI expander comprising a springV element vhaving side members and skirt` engagingmembers, a supporting element secured to each of said side members, eachsupporting element having a perforated lobefor receiving thepiston pin and an extended portion forrengagement with the inside of the piston skirt.

Y 1 6. Apiston skirt expander comprising a spring element of the general shape ofan oval having a gap in one long side Vthereof and thesopposite side serving as a spring exerting tension along the long axis of the oval, and means for securing the expander in a piston skirt.'l

7. -A piston skirt expander comprising a spring element of the general shape ,of an oval having a gap in one long side thereof andthe opposite sidevserving as asspring exerting tension along the, long axis of the oval, and oppositely disposed supporting element. e

8.v A piston skirt expander comprising a spring element of the general-shape of an oval having a gap in one longside thereof and the opposite side serving as a spring exerting .tension along ears connected to said spring I the long axis of the oval, and a supporting ear securedto each offsad sides of the spring element, each of said supporting ears having abutf for securing-the expander ina piston skirt.

VCII-IARLES A. MARIEN.

MELVIN W. MARIEN. 

